I uploaded my schema changes to the remote production server just a bit ago with the latest 4.5.3 set for install. I npm installed then built the admin panel. I ran into the same issue.
So, basically I got into the specific main.xxxxxx.js file where the maxLengthCharacters string is located, did a quick find and appended it to read as options.maxLengthCharacters, this fixes the problem there as well.
Hopefully I won’t have to do this with each new build in future upgrades but it’s not a HUGE problem as it’s not really difficult to do.